KR0143227B1 - Device and process for monitoring material flow, and use of the process - Google Patents

Abstract

The present invention relates to an apparatus and a method for measuring large flow rates of, for example, 1 to 50 tonnes per hour in materials that do not readily flow, such as grain.

The flow of material is intermittently guided into the vertical conveyor for a while from being discharged substantially horizontally by means of a discharge screw with a controlled rotation speed.

The conveyance is periodically monitored for its volume and weight by different measurements.

The invention also relates to the use of the method and to measuring flow rates for control purposes in such mills, for example for the control of milling processes such as control of the mill input and supply of moisture or special weighing in flour weighing devices. It is about a method.

Description

[Name of invention]

Quantitative measuring device for fluids, measuring method and application of the method

[Brief Description of Drawings]

1 is a view showing a quantitative measuring apparatus of the present invention.

2 is a diagram showing the differential mass measurement step of FIG.

3 is a view showing an analog quantitative measuring device of the sending step in the present invention

4 is a diagram of a conventional differential-quantitative delivery method.

5 is a view showing a process of changing the weight of the material in the weighing container over time.

6 shows the application of the invention to a mill represented by a diagram.

* Explanation of symbols for main parts of the drawings

1: Flow measuring device 2: Material input part

6: input tube 7: discharge tube

8: Mass measurement part 10: weighing container

11: Screw conveyor 12: Material passing section

Detailed description of the invention

[Technical Field]

The present invention relates to, for example, a quantitative measuring device for bulk grains that do not flow easily in a grain grinder and a measuring method thereof. More specifically, the present invention monitors the flow of substances having poor fluidity, such as bulk grains or flours thereof. The present invention relates to an apparatus, a method, and an application of the method.

[Prior art]

In recent production equipment such as automated grinders and feed grinders, it is almost impossible to increase production using conventional measuring instruments, but nevertheless the quality of the product is inevitably deteriorated in order to increase production. .

In order to further increase production capacity without changing the quality of the product, more detailed control and control of material flow is required.

And the amount of total processing or instantaneous supply must be measured very precisely.

Accurate weighing means weighing with a precision instrument, which means that it is necessary to continuously supply the material in the middle. Therefore, accurate weighing refers to the repetition of the process of putting the material into the measuring device and then discharging it. The solution is to install an intermediate repository, which can be expensive to install again.

For materials with poor flow properties, for example wheat flour, wheat flour mixture, bran, etc., belt-conveyor scales are used when it is necessary to continuously measure and supply the quantity in the flow process.

The characteristics of the belt-conveyor scale have no influence on the flow of the material, and the material is continuously loaded into the belt-conveyor and discharged continuously after being weighed.

However, this method has two drawbacks.

First: belt-conveyor scales are less accurate than conventional container scales.

In other words, if the latter operates within a tolerance of ± 1 to 2%, the former is ± 2% to 1%.

Second: Belt-conveyor scales are expensive to install.

In particular, maintenance, cleaning, maintenance, etc. are more expensive, resulting in a high cost of material processing.

In addition, belt-conveyor scales occupy a large amount of installation area horizontally, making it difficult to popularize in food or feed mills, and many attempts to monitor the flow of materials by other measuring systems have been made, but not properly.

Another problem is in the pass-through capacity, which can typically be 10 to 50 tonnes or more per hour, but using a belt-conveyor scale in mills has the drawback of passing about 1 tonne per hour.

[Initiation of invention]

The present invention is capable of measuring the flow of many materials by measuring the capacity very precisely, continuously discharging the material like a belt-conveyor scale, and working accurately without clogging even if the material is not easily flowed. The purpose is to develop a measurement system.

The solution of the present invention is characterized by having one metering vessel placed vertically, a screw conveyor installed horizontally and having a feeder, a rotating speed controlled, a passage connecting the screw conveyor in the metering vessel and an automatic measuring member.

The present invention resides in that there is one metering barrel installed vertically, and the material discharged from the metering force is forcibly transported and discharged by a screw conveyor which can be adjusted.

The weight is measured in a differential-weighing method by means of a vertically mounted weighbridge in a conventional manner.

In general, horizontally mounted conveyors have no effect on the weight signal on the vertical line.

Differential weighing means that the material being discharged is measured very accurately and continuously controlled by a screw conveyor with adjustable speed, and is taken out completely continuously.

The material is flowed in a natural and continuous way by the bent part, ie the cylindrical measuring cylinder (the meter), the horizontal screw conveyor, the passage connecting the vertical measuring container and the horizontal conveyor. .

At this time, the weighing tank is like a storage chamber continuously discharged by gravity, and the horizontal movement is mechanical and forced.

Here, a vertically weighing container, a passage part, a screw conveyor moving in one horizontal direction, and a driving motor that protrudes in the opposite direction and constitute a weighing and carrying out unit, and the unit has three bent pedestals. Is supported.

The passing section disposed between the weighing barrel and the screw conveyor is effective because its cross section is almost constant. When the cross section of the weighing barrel is circular, the cross section of the passing part is circular to rectangular.

Due to the shape of the passage, a uniform flow of material can be achieved in all meters when the meter's regulator is programmed to regulate the supply.

Since the material in the weighing tank is replenished within a short time and the material is slowly transported out of the weighing tank, even if the amount of material in the tank changes, the feed and take-out does not affect the feed rate. Since it does not affect the transport and export, the transport and export are stable and thus are measured accurately.

Thus the flow of material is constant and the meter can be operated before stopping in the middle of work or during material change. The whole weighing unit can also be supported or leaned on the pedestal.

In particular, when the device needs to be clean, there is an orbit where the screw conveyor can be separated at the lower part of the weighing unit, so that the drive motor and the screw conveyor can be horizontally separated for cleaning.

In the case of continuous supply, a supply preparation container with a top and bottom opening and closing plate may be installed.

The storage area can accommodate 30% to 90% of the volume of the weighing container, and the time period of storage can be in the range of 2-3 seconds to 30 seconds.

The invention also relates to a method, characterized in that the flowing material is intermittently introduced into a differential weighbridge of an upright for a short time and discharged horizontally by a screw conveyor.

It is particularly advantageous if the differential weighing time takes up to five times the reloading time.

In the present invention, the method of differential weight measurement is applied from the weighing technology to the monitoring of production.

And for larger production capacities, each metering unit must be operated in a capacity analytical method, which requires a large hopper and container to reduce reload time.

And when the production capacity is large, there are many problems in the installation place even in the case of the differential-quantitative transmitter as in the case of the conveyor type meter.

In general, in the differential-quantitative delivery method, the working time by volume analysis is about 1% of the total working time.

In other words, if the production capacity is large, the refill-installation takes up a lot of installation space.

In recent years, there has been a problem in the accuracy of differential quantitative transmitters when the allowable capacity is more than 1-2 tons per hour.

According to the present invention, the time delay can be minimized and precisely weighed, and the next processing step can be continuously transferred.

The result is more accurate because the time taken per cycle is shortened and the calculation is performed by statistical processing.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In detail, the differential weight is measured while the supply of material in the weighing vessel is stopped in order to calculate the instantaneous delivery in unit time and the total passage of material flowing during the selected constant time. It can be seen that the number is identified.

In addition, inside the metering container, where the material is continuously released, most of the material passing through the material is always in the flow state, which is not easily flown in food or feed mills.

The stopping of the supply is done by adjusting it for each material or by installing a small reservoir.

For example, the bottom opening and closing plate shows that the material is stored in the supply preparation container for several seconds.

Since the supply reserves do not belong to the weighing unit, simple mechanisms for dispensing without interrupting the accuracy of the measurement and blocking them are possible.

The material passage is measured by periodically dispensing the volume of material that is continuously discharged from the weighing vessel at the differential-weight.

In particular, the ratio of the amount of passage and the number of revolutions of the screw conveyor determined by the differential weighing method is set and memorized so that the criterion after the metered supply load for the same or similar material is set in advance.

If the flow of material is not readily controlled when the flow changes significantly, or if the flow of material is large, one or more input-cycles may be determined for a period of time for a period of time.

Differential gravimetric starts after a certain period of time, so the material is first discharged based on the standard volume.

It is convenient to change the dosing cycle-time for the next constant time by the weight difference when continuing differential weighing.

It is very effective if the material is measured by differential gravimetry before and after milling in the mill, and the measurement is effective in determining the ratio of the product to the material and in determining other parameters in adjusting the mill.

The present invention also allows accurate measurement of material and qualitative addition of the main material even if the material flow changes slightly over time by the processing.

This is done by the following procedure.

When one main meter is placed to mix two or more flows of material, and each of the differential meters with a set speed standard starts to rotate with the main meter, the output capacity of the differential meters is the weight measured by the main meter. Value is adjusted.

And control the work process before supplying water to the mill, control at the start of the work and milling process, or periodically control the material of the powder weighing machine. Measuring is a very effective way.

EXAMPLE

First, FIG. 1 will be described.

The feed P1 of the material flows into the flow rate measuring device 1 vertically from the top and is discharged from the flow rate measuring device 1 as the feed P2 of the material.

The flow measuring device 1 having the material input part 2 installed on the upper part is connected to the pedestal 3 by the support 4 and is installed on the bottom surface 5, and the input pipe 6 and the discharge pipe above and below the bottom part 5 are provided. (7) is located.

The mass measurement part 8 is connected to the material input part 2 and the discharge pipe 7 by the flexible rubber duct 9 which can also prevent dust.

The mass measurement part 8 is comprised from the vertically provided measuring container 10 by which the diameter of the lower end part 10 'is reduced.

The weighing container 10 and the lower end 10 'of the weighing container have the form of a circular tube.

Between the metering vessel 10 and the screw conveyor 11 is configured a passage 12 to allow the material to flow well from the vertically installed metering vessel 10 to the screw conveyor 11 placed horizontally.

As shown in FIG. 1, the cross section of the passage 12 extending from the upper side to the lower side is almost constant and has a circular to rectangular shape.

The mass measuring section 8 is connected to three mass storage devices 13 around it, which in turn are connected to the pedestal 3.

In the configuration of the entire mass-measuring unit 8 including the driving motor 14, the driving motor 14 and the screw conveyor 11 protrude in opposite directions to the mass measuring unit 8, and have a central axis 15. It is intended to balance each other.

The supply preparation container 16 is connected to the lower part of the input pipe 6, and the supply preparation container 16 is connected to the compressed air cylinder 17 by the control of the electronic regulator 19 or the signal converter 20 according to a program. The standard value of the material to be taken out as operated by adjusting the opening and closing plate 18 is obtained from a calculator 21 located outside, and a signal for transmitting the actual value of the material to be taken out is obtained by the mass storage device 13.

The capacity of the supply preparation container is effective at about 30% to 90% of the maximum capacity of the weighing container 10, which is less than 50%. This means that the material flows when the device for adjusting the input volume is not used. Since the input amount can be measured in this way, the conventional differential meter method is not applied in the present invention.

The diameter of the measuring container can be 0.3 to 0.6 m, and the height of the container is about twice as high.

Since the diameter of the screw cylinder is 0.100 to 0.250 m, the average ratio of the cross section of the measuring cylinder to the cross section of the screw cylinder is 1:10.

1 shows another configuration. The shaft 22 of the screw conveyor can be inserted and detached in the direction of the axis 24 of the screw conveyor 11 by the extension rod 23 together with the driving motor 14 attached thereto.

This arrangement allows the meter to stop briefly when it is necessary to clean the passage through which the material flows.

The material is continuously conveyed in the vertical direction in the weighing vessel 10 of the upright, horizontally transferred by the screw conveyor 11 via the passage 12, and then again in the vertical quantity, and then again inspected through the discharge pipe 7 Is discharged out.

The apparatus of FIG. 2 is the same apparatus as in FIG. 1 in the step of determining the quantity by gravimetry with the opening plate 18 closed.

In this step, the amount of discharge may be measured by the weight of the material in the weighing container 10 which is differentially weighed while the material is being discharged or is reduced as the material is continuously discharged.

3 is similar to FIG. 2 except that there is no supply container.

Here it is dispensed and dispensed in a quantity determined by volume measurement.

Figure 4 shows the progress of the conventional differential-quantitative transmission device.

The process is characterized by a very short dosing time and a long gravimetric mass measurement time.

5 shows the period (cycle) of the mass measurement according to the present invention.

A is the starting point for the input of materials, which begins to be fed regularly into the weighing tank of the differential meter.

At B, differential weighing is performed to stop the feeding of the material into the weighing box and at the same time, the material which is not influenced by the shaking from the weighing container is reduced inside the weighing tank and the weight is reduced per unit time. The differential metering ends.

The material accumulated in the reserve reservoir 16 between B and A 'is fed into the differential meter (cylinder) between the points until the point C.

From point C to D, regular input is made within a short time, and then material input is stopped again at that point.

And a second differential metering between D and A '.

Here, to adjust the following two cases

That is, at least two differential weighing cycles have a constant time for adjustment when the change of the discharge from the differential meter occurs when there is no influence from the input, or when the change of the input occurs when the standard discharge reaches a predetermined reference value. It is critical to make sure that the time between the input and the discharge occurs, which is indicated in the figure as follows.

t1: Weight measurement time t2: Input time

t3: Adjustment time t: Cycle time

Here the adjustment is made by the formula: (Qsoll: standard quantity, Qlst: actual quantity)

In this formula, (a) is Y-X. (B) is Y → and is the orthogonal axis with respect to the longitudinal axis (kg), and (a) (b) is a perfect function if it is proportional to 0 value.

In FIG. 6, the entire mill is shown.

Here, the mill 30 and the left and upper blocks are equipped with a stop preparation and a mill preparation device 31. The powder silo 32 is provided on the upper right side, and a grinder with a flat body and a powder cleaner on the left and lower sides. 33 is provided, and the powder mixer 37 is comprised in the right side and the lower side.

In the drawings, the portion to which the present invention is applied is circled. In order to continuously monitor the flow of material, the mill is equipped with a blast furnace (part B) and a milling furnace (part C).

Claims (7)

In a method for measuring the feed (P ₁ , P ₂ ) of poorly flowable material in a manufacturing facility, for example in a mill, a) the feed (P ₁ ) of the material is intermittent filling time (A'-D) B) is continuously transported horizontally by the screw conveyor 11, which is guided to the upright weighing vessel 10 and b) from which the rotational speed is controlled, and c) the weight of the material P2 being transported out. Measured by electronic differential weighing during weighing time (B-A), DA with '-D), and the instantaneous rotational speed of the screw conveyor 11 to calculate the instant release amount and / or the total material transfer amount per unit time Correlated with each other, and d) the ratio of the gravimetric time (B-A ', DA) to the filling time (A'-D) is selected in the range of about 1: 5. 2. A method according to claim 1, wherein the entire weighing cycle, which is the sum of the filling time and the weighing time, is selected with a short cycle time ranging from several seconds to 30 seconds. The method according to claim 1 or 2, wherein a) the input amount of the incoming material transfer (P ₁ ) is preset, b) the filling time (A'-D) of a predetermined time is preset, and c) the weighing tank ( 10) the weight is continuously checked, d) the differential weight value in the weighing tank 10 is measured during the weighing time (B-A ', DA), and e) the withdrawal of material changes the rotational speed of the screw conveyor. F) the material adapted to the carrying amount to be discharged from the weighing vessel (10) at the minimum delay time after precise weighing. 4. A method according to claim 3, wherein the ratio of the discharge to the rotational speed of the screw conveyor 11 determined by differential gravimetric is stored and preset as a command for volumetric volumetric delivery of the same or similar material, which is started after a certain delay time. Characterized in that during each differential weighing time the material is discharged at a predetermined volumetric requirement. 2. The differential differential weighing of claim 1 wherein primary differential gravimetric is assigned for mixing two or more material transfers, each additional differential gravimetric commences with the primary differential gravimetric at a predetermined rotational speed requirement. Controlling emissions according to the actual gravimetric values of the main differential gravimetric measurements. In using the method of any one of claims 1, 2, 4 and 5 in a mill, this method controls the mill preparation device 31, the mill 30 and the grinder 33. Or quantitative measurement of fluids, characterized in that it is used to determine the yield and determine other parameters by measuring mass flow before and after milling. In order to carry out the method of any one of claims 1, 2, 4 and 5, a) one upright weighing container 10 and b) open to the weighing container 10 side and weigh the product. The material feed tube (6) and c) with the opening and closing plate (18) capable of intermittently controlling the material transfer (P ₁ ) to the weighing vessel (10) to the weighing vessel (10) and the ratio of the cut-off time and the allowable closing time Electronic regulator 19 controlling the opening and closing plate 18 to be in the range of 1: 5 and the screw discharging material in the direction of the axis 24 and its rotation speed is controllable and connected to the lower portion of the weighing vessel 10. In the having a conveyor (11), the screw conveyor (11) is quantitative measuring apparatus of the flow material, characterized in that configured to be pulled out like a drawer in the direction of the axis (24) by the extension rod (23).